scholarly journals Simulations of a hypothetical temperature control structure at Detroit Dam on the North Santiam River, northwestern Oregon

2015 ◽  
Author(s):  
Norman L. Buccola ◽  
Adam J. Stonewall ◽  
Stewart A. Rounds
Keyword(s):  
Temperature Control ◽  
Control Structure ◽  
The North

Analysis of Temperature Control Mode of Concrete Construction in Winter

2013 ◽  
Vol 368-370 ◽  
pp. 847-850
Author(s):  
Yan Jie Liu ◽  
Lin Ding ◽  
Yong Jiang Zhao ◽  
Kun Hu
Keyword(s):  
Temperature Control ◽  
Control Mode ◽  
Cold Winter ◽  
Pouring Temperature ◽  
Concrete Construction ◽  
Mixture Ratio ◽  
Storage Method ◽  
The North ◽  
Method Construction

Winter concrete construction is inevitable to cold winter in the north of China.Concrete antifreezing and frost are the emphasis and difficulty in winter construction.In the present work, the method of concrete construction in winter and the mixture ratio adjustment of concrete in storage method construction were introduced, expounds the concrete during transportation and pouring temperature control matters.

scholarly journals Variability of the surface water partial pressure of CO<sub>2</sub> in the North Sea

2005 ◽  
Vol 2 (4) ◽  
pp. 757-777 ◽  
Author(s):  
H. Thomas ◽  
Y. Bozec ◽  
K. Elkalay ◽  
H. J. W. de Baar ◽  
A. V. Borges ◽  
...  
Keyword(s):  
Biological Control ◽  
Partial Pressure ◽  
North Sea ◽  
Temperature Control ◽  
Co2 Removal ◽  
Net Community Production ◽  
Data Set ◽  
High Resolution Data ◽  
The North ◽  
The North Sea

Abstract. The seasonal variability of the partial pressure of CO2 (pCO2) has been investigated in the North Sea, a northwest European shelf sea. Based on a seasonal, high resolution data set the main controlling factors - biological processes and temperature - have been identified and quantified. In the central and northern parts being a CO2-sink all year round, the biological control dominates the temperature control. In the southern part, the temperature control dominates the biological control at an annual scale, since the shallow water column prevents stronger net-CO2 removal from the surface layer due to the absence of seasonal stratification. The consequence is a reversal of the CO2 sea-to-air flux during the spring bloom period, the only time, when CO2 is taken up from the atmosphere in the southern region. Net community production in the mixed layer has been estimated to 4 mol C m-2yr-1 with higher values (4.3 mol C m-2yr-1) in the northern part and lower values in the southern part (2.6 mol C m-2yr-1).

Temperature Control in an Annealing Furnace, Using the IMC Strategy

2016 ◽  
Vol 859 ◽  
pp. 124-128
Author(s):  
Vlad Mureşan ◽  
Mihail Abrudean ◽  
Iulia Clitan ◽  
Mihaela Ligia Ungureşan ◽  
Tiberiu Coloşi
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Temperature Control ◽  
Analytical Modeling ◽  
Control Structure ◽  
Internal Model Control ◽  
Temperature Control System ◽  
Model Control ◽  
Fractional Order Controller ◽  
The Mathematical Model

In this paper, a solution for temperature control in a tunnel heat-treatment furnace, used in metallurgy, is presented. The mathematical model of the heating technological process associated to the furnace is expressed using a system of ordinary differential equations and it results through analytical modeling. Based on the determined mathematical model, a temperature control structure which uses the Internal Model Control strategy is proposed. In order to obtain the restrictive control performances imposed by the heat-treatment procedure, the proposed temperature control structure contains two controllers which are tuned using an iterative method and which are used alternatively for the temperature control. The simulations of the temperature control system are presented in a comparative manner, highlighting the main differences between the solution proposed in this paper and the cases of using a classical integer-order controller and a fractional-order controller.

scholarly journals Controls of the surface water partial pressure of CO<sub>2</sub> in the North Sea

2005 ◽  
Vol 2 (4) ◽  
pp. 323-334 ◽  
Author(s):  
H. Thomas ◽  
Y. Bozec ◽  
K. Elkalay ◽  
H. J. W. de Baar ◽  
A. V. Borges ◽  
...  
Keyword(s):  
Biological Control ◽  
Partial Pressure ◽  
North Sea ◽  
Temperature Control ◽  
Co2 Removal ◽  
Net Community Production ◽  
Data Set ◽  
The North ◽  
Shelf Sea ◽  
The North Sea

Abstract. The seasonal variability of the partial pressure of CO2 (pCO2) has been investigated in the North Sea, a northwest European shelf sea. Based on a seasonal and high spatial resolution data set the main controlling factors - biological processes and temperature - have been identified and quantified. In the central and northern parts being a CO2-sink all year round, the biological control dominates the temperature control. In the southern part, the temperature control dominates the biological control at an annual scale, since the shallow water column prevents stronger net-CO2 removal from the surface layer due to the absence of seasonal stratification. The consequence is a reversal of the CO2 sea-to-air flux during the spring bloom period, the only time, when CO2 is taken up from the atmosphere in the southern region. Net community production in the mixed layer has been estimated to 4 mol C m-2 yr-1 with higher values (4.3 mol C m-2 yr-1) in the northern part and lower values in the southern part (2.6 mol C m-2 yr-1).

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